Check all battery connection they must be clean and tight. Also check
negative battery connection on frame and motor. If that don't help have
alternator tested. It should be putting out 14.5 volts to keep battery
charged. If it's not replace it. If all that checks out you might have a
parasitic draw issue.

the car was having trouble starting it would always turn over but it would take a few times to start but always started until one night I needed a jump so the next day I replaced the battery didn't so...